The Klein Tools ET310KIT Circuit Breaker Finder Kit is a circuit breaker finder kit for electricians, maintenance techs, remodelers, and serious DIY users who need to identify the correct breaker without trial and error. This is a circuit breaker finder kit designed for locating the correct breaker on 90 to 120 volt alternating current circuits and testing GFCI outlets. Model Number: ET310KIT.

In real use, the setup is straightforward: the transmitter connects at the outlet or fixture, and the receiver scans the panel until it identifies the matching breaker with visual and audible indication. That matters when you are working in an occupied home, chasing the right branch circuit in a busy panel, or trying to shut down one run without killing power to half the building.

The transmitter does more than just send a signal. It also checks outlet wiring condition and tests GFCI devices, which makes this kit more useful than a single-purpose breaker tracer. If you are troubleshooting a receptacle, you can get confirmation on common wiring conditions before moving on to the panel. That saves extra trips and helps narrow down whether the issue is the circuit, the device, or the wiring.

Where this kit gets more versatile is the accessory package. The included alligator clip adapter lets the transmitter connect to bare wires, and the light socket adapter lets you trace the circuit feeding a lighting fixture. The three-prong to two-prong grounding adapter expands the number of outlets you can work with. For service work and older properties, that flexibility is a big deal because you are not limited to one outlet style or one type of fixture.

Klein also put some thought into storage and jobsite practicality. The components are organized in a premium hard carrying case with a dense foam insert, so the receiver, transmitter, adapters, and battery are not floating around loose. The receiver and transmitter are compact, the receiver uses one 9 volt battery, and the unit is rated for CAT II 120V use with 6.6 foot drop protection, which is the kind of detail that matters when tools live in a pouch, truck, or service bag.

This kit is made for North American style grounded electrical outlets and common 90 to 120 volt alternating current branch circuits. If your work involves service calls, outlet replacement, lighting changes, panel identification, punch-list correction, or general electrical troubleshooting in residential and light commercial spaces, this is the kind of specialty tester that earns its keep quickly.

Bottom line: if you need a dedicated breaker finder that also helps check outlet condition and reach more fixture types with included adapters, the Klein Tools ET310KIT Circuit Breaker Finder Kit is the smarter buy than piecing together separate testers and adapters later.

Why the Klein Tools ET310KIT Circuit Breaker Finder Kit Earns a Spot in the Service Bag

This is the kind of specialty electrical tester you appreciate the first time it keeps you from flipping breakers one by one and making three extra trips to the panel.

• Who it's for: Electricians, service techs, maintenance crews, remodelers, and homeowners who do real electrical troubleshooting on 90 to 120 volt alternating current circuits.
• Why it stands out: You are getting breaker tracing, GFCI testing, outlet wiring checks, and useful adapters for light sockets and bare wires in one organized kit.
• Worth knowing: This is built around North American style grounded outlets and 90 to 120 volt alternating current work, so it is the right tool for that lane, not a universal meter for every system.

• What does this kit do? It identifies the breaker that corresponds to an outlet or fixture on 90 to 120 volt alternating current circuits and also tests GFCI devices and outlet wiring condition through the transmitter.
• Can it be used on lighting circuits? Yes. The included light socket adapter lets the transmitter connect to a light socket so you can trace the correct circuit for a lighting fixture.
• Can it work on bare wires? Yes. The included alligator clips adapter is provided for use on bare wires.
• What battery does it use? The receiver uses one 9 volt battery, and the battery is included.